# 在python中统一了类与类型的概念
class Foo():
    pass
# <class '__main__.Foo'>
print(Foo)
obj = Foo()
# print(obj)
# <class '__main__.Foo'>
print(type(obj))

print(str)
# ctrl 按住不动 点击鼠标左键
name = str('dahai')
# 其实python在'dahai'的前面自动加了一个str类
print(type(name))